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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The type of rotary compressor used in gas turbines, is of

Centrifugal type
Radial flow type
Axial flow type
None of the listed here

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Compressors, Gas Turbines and Jet Engines
The absolute pressure of air at the outlet of a compressor is called

Back pressure
None of the listed here
Discharge pressure
Critical pressure

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Compressors, Gas Turbines and Jet Engines
The overall thermal efficiency of an ideal gas turbine plant is (where r = Pressure ratio)

1 - (1/r) ɣ/ɣ-1
r ɣ-1
1 - (1/r) ɣ-1/ɣ
1 - r ɣ-1

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Compressors, Gas Turbines and Jet Engines
The volumetric efficiency of a compressor

Increases with increase in compression ratio
Increases with decrease in compression ratio
Decreases with increase in compression ratio
Decreases with decrease in compression ratio

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Compressors, Gas Turbines and Jet Engines
If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix ‘I’ and ‘o’ stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity

V = Uo
Vi = Vo
U < Vo
Vt > Vo

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Compressors, Gas Turbines and Jet Engines
In a jet propulsion unit, the products of combustion after passing through the gas turbine are discharged into

Discharge nozzle
Atmosphere
Vacuum
Back to the compressor

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MORE MCQ ON Compressors, Gas Turbines and Jet Engines

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